using java, finish the two arrayList methods below: public int indexOf(Object o) { } public E remove(int index) { } and then create a class to test the ArrayList methods
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using java, finish the two arrayList methods below:
public int indexOf(Object o) {
}
public E remove(int index) {
}
and then create a class to test the ArrayList methods
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- Write Java code for the following: a. Create an Arraylist that can hold Integer objects. b. Check and display whether the Arraylist is empty or not. C. Add an element 50 into the Arraylist. d. Add another element 60 in the position of 0 in the Arraylist. e. Replace the element to 70 in index 1.Question 4 Write Java code for the following: a. Create an Arraylist that can hold Integer objects. b. Check and display whether the Arraylist is empty or not. c. Add an element 50 into the Arraylist. d. Add another element 60 in the position of 0 in the Arraylist. e. Replace the element to 70 in index 1.QUESTION 3 Save Answer Write the missing statements as per given comments to complete the programs. Java program for flexible array using ArrayList import java.util.ArrayList; import java.util.lterator, public class IteratorPatternDemo { public static void main(String args | DE I/ Define an object of ArrayList named as aryStack I| Add or push "Ahmed" on the top of aryStack i.e., at position 0 I| Add or push "Khalid" on the top of aryStack | Add or push "Majid" on the top of aryStack I/ Remove first name from aryStacki.e., from position 0 // Define an iterator "it" on aryStack I/ Write code to display all names in aryStack using the iterator • while( String obj = (String)it.next(): System.out.printin(obj): }}
- Computer Science create a method +addToList(o:E):void that adds the object (o) to the ArrayList referenced by the instance variable list. create a method +removeFromBackOfList():E that removes the object at the back of the ArrayList and returns it.Correct the following wrong statements. In Java, method overloading means that a program may contain more than one method with same signatures. Each column in a 2D array could be dealt with as 1D array.when an individual array element of an array of type int is passed to a method, it is passed by reference. True False note : in a java
- 5. How to find all the leaders in an integer array in java? An element is leader if it is greater than all the elements to its right side. And the rightmost element is always a leader. For example int the array {16, 17, 4, 3, 5, 2}, leaders are 17, 5 and 2..Java Problem: Implementing a method to print a cell's neighbors on a 2D array. The method's header is provided. The main method (do not alter it)w ill read N numbers to create the 2D array and it will call the method for you. Do not go out of the bounds of the 2D array. I have attached what it should look like with the following input: 4 4 1 2 3 4 7 8 9 10 13 14 15 16 19 20 21 22 2 2 Code I have so far: import java.util.Arrays;import java.util.Scanner;public class Problem3 {public static void printNeighbours(int[][] data, int row, int col){}public static void main(String[] args) {Scanner kb = new Scanner(System.in);int[][] data = new int[kb.nextInt()][kb.nextInt()];for (int i = 0; i < data.length; i++) {for (int j = 0; j < data[0].length; j++) {data[i][j] = kb.nextInt();}}System.out.println("The 2D Array:");for (int[] cols : data) {System.out.println(Arrays.toString(cols));}int row = kb.nextInt();int col = kb.nextInt();System.out.printf("The centre point is: %d %d…java Write a program to do the following: Create an ArrayList of Student. Add 7 elements to the ArrayList. Use for each loop to print all the elements of an ArrayList. Remove an element from an ArrayList using the index number. Remove the element from an ArrayList using the content (element name).
- In Java: Write a method that multiplies all elements in the array by 3 and returns it to the main method.Create a Java array FirstArray, type int, length 10. Initialize it with the multiple of 2. Print the array using comma separators. (Hint: Use Arrays.toSring method. You need to import java.util.Arrays package) Print the array with vertical line (|) separator. DO NOT put the vertical line after last element.5. Now examine the for-loops in the above Java program. (assume that we have the have replaced the array with an ArrayList) a) Which ArrayList method should you use to control the for-loop iterations? b) Explain why the first for-loop cannot be controlled by that ArrayList method (but the other two for-loops can). Here is a quick review of how array elements are modified and accessed: 1. public class BasicArray{ 2. public static void main(String[] args) int[] basic = new int[4]; for (int i=0; iSEE MORE QUESTIONS